Ex 1 & 2) Harry Potter's uncle, aunt, and cousin have no connections to the magical world or magical abilities, and are referred to as muggles.

3) A group of geocachers, role-players, harry potter fans speaking of a non-roleplayer/geocacher/harry potter fan etc... "I tried to explain it to her, but she was such a muggle. She didn't get it." or "Avoid the muggles, they're all over the park this afternoon."

Any person who has no knowledge of the sport of Geocaching and who causes geocachers to become surreptitious about their activities in order to avoid a cache becoming exposed to non-geocachers. Also referred to as a GeoMuggles

The geocacher found what he knew must be the cache site, but waited until the muggles left so they would not see him and possibly plunder the cache.